It was around 23:15hrs I was observing the the sky,when sudently I saw what appear to be a comet with a long very bright conical tail.It was located aproximately NW and very high.Sudently it started moving very fast in zig-zags to SW with a redish point and it desapeared living the long bright tail behind for a few minutes.It was not a comet,It was not a meteorite,it was not space debris, because debris or meteorites don't circle and don't stop in the air.What could it be? Note that this UFO was seen in various places in Portugal and was on TV and all the press but no reason was given for this UFO.((NUFORC Note: We believe the correct date to be June 1st. We have amended the date above. PD))